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by type0 2868 days ago
Also it has some fascinating history:

> Joseph Buford Cox invented what is now known as the chipper type chain for chain saws. He based his design on the C-shaped jaws of the larva of the timber beetle. > He only reached the fifth grade in his formal education.

from https://en.wikipedia.org/wiki/Joseph_Buford_Cox

If you think that sharpening is complicated now, think again, it must have been impossible before this guy.